Note 6 - Loans Receivable and Allowance for Loan Losses (Details) - Impaired Loans (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Financing Receivable, Impaired [Line Items]
Impaired loans with no related allowance, recorded investment	$ 17,313		$ 16,742
Impaired loans with no related allowance, unpaid principal balance	22,914		20,638
Impaired loans with allowance, recorded investment	18,981		18,902
Impaired loans with allowance, unpaid principal balance	21,776		23,205
Impaired loans with allowance, related allowance	4,971		5,130
Impaired loans, recorded investment	36,294		35,644
Impaired loans, unpaid principal balance	44,690		43,843
Impaired loans, related allowance	4,971		5,130
Impaired loans with no related allowance, average recorded investment	17,028	11,336
Impaired loans with no related allowance, interest income recognized	185	113
Impaired loans with allowance, average recorded investment	18,941	21,134
Impaired loans with allowance, interest income recognized	33	174
Impaired loans,average recorded investment	35,969	32,470
Impaired loans, interest income recognized	218	287
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Impaired loans with no related allowance, recorded investment	11,764		11,964
Impaired loans with no related allowance, unpaid principal balance	11,863		11,969
Impaired loans with allowance, recorded investment	13,013		13,118
Impaired loans with allowance, unpaid principal balance	13,140		13,245
Impaired loans with allowance, related allowance	3,838		3,858
Impaired loans, recorded investment	24,777		25,082
Impaired loans, unpaid principal balance	25,003		25,214
Impaired loans, related allowance	3,838		3,858
Impaired loans with no related allowance, average recorded investment	11,864	6,772
Impaired loans with no related allowance, interest income recognized	162	106
Impaired loans with allowance, average recorded investment	13,066	13,173
Impaired loans with allowance, interest income recognized		138
Impaired loans,average recorded investment	24,930	19,945
Impaired loans, interest income recognized	162	244
Commercial Real Estate Construction Financing Receivable [Member]
Financing Receivable, Impaired [Line Items]
Impaired loans with no related allowance, recorded investment	155		61
Impaired loans with no related allowance, unpaid principal balance	3,899		158
Impaired loans with allowance, recorded investment			316
Impaired loans with allowance, unpaid principal balance			3,741
Impaired loans with allowance, related allowance			217
Impaired loans, recorded investment	155		377
Impaired loans, unpaid principal balance	3,899		3,899
Impaired loans, related allowance			217
Impaired loans with no related allowance, average recorded investment	108	799
Impaired loans with allowance, average recorded investment	158	641
Impaired loans,average recorded investment	266	1,440
Commercial Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Impaired loans with no related allowance, recorded investment	3,943		3,764
Impaired loans with no related allowance, unpaid principal balance	5,229		7,275
Impaired loans with allowance, recorded investment	1,559		1,457
Impaired loans with allowance, unpaid principal balance	4,226		2,057
Impaired loans with allowance, related allowance	308		211
Impaired loans, recorded investment	5,502		5,221
Impaired loans, unpaid principal balance	9,455		9,332
Impaired loans, related allowance	308		211
Impaired loans with no related allowance, average recorded investment	3,854	2,539
Impaired loans with no related allowance, interest income recognized	21	1
Impaired loans with allowance, average recorded investment	1,508	4,308
Impaired loans with allowance, interest income recognized		1
Impaired loans,average recorded investment	5,362	6,847
Impaired loans, interest income recognized	21	2
Owner Occupied Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Impaired loans with no related allowance, recorded investment	878		524
Impaired loans with no related allowance, unpaid principal balance	1,083		528
Impaired loans with allowance, recorded investment	4,409		4,011
Impaired loans with allowance, unpaid principal balance	4,410		4,162
Impaired loans with allowance, related allowance	825		844
Impaired loans, recorded investment	5,287		4,535
Impaired loans, unpaid principal balance	5,493		4,690
Impaired loans, related allowance	825		844
Impaired loans with no related allowance, average recorded investment	701	678
Impaired loans with no related allowance, interest income recognized	1	5
Impaired loans with allowance, average recorded investment	4,209	2,911
Impaired loans with allowance, interest income recognized	33	35
Impaired loans,average recorded investment	4,910	3,589
Impaired loans, interest income recognized	34	40
Consumer Other Financing Receivable [Member]
Financing Receivable, Impaired [Line Items]
Impaired loans with no related allowance, recorded investment	573		429
Impaired loans with no related allowance, unpaid principal balance	840		708
Impaired loans, recorded investment	573		429
Impaired loans, unpaid principal balance	840		708
Impaired loans with no related allowance, average recorded investment	501	548
Impaired loans with no related allowance, interest income recognized	1	1
Impaired loans with allowance, average recorded investment		101
Impaired loans,average recorded investment	501	649
Impaired loans, interest income recognized	$ 1	$ 1

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Average amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 15

-Subparagraph (c)(1)

-URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5212-111524

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 17

-URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5258-111524

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 14A

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953550-111524

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